Steam-boiler.



No. 872,077. PATENTED NOV. 26, 1907.

" D. MOSHER.

STEAM BOILER. APPLIUATION FILED DB0. 17. 190e.

3 SHEETS-SHEET l.

C] Noun? PATENTED NOV. 26, 1907.

o. D. MosHER.

STEAM BOILER.

APPLIOATION FILED 13110.17. 1906.

3 SHEETS-SHEET 2.

Y wimax@ f" 1 ,.Cbwfn A5 @51j @Houtsma IRAM No. 872,077. PATENTED NOV. 26, 1907.

C. D. MOSHER. STEAM BOILER.

APPLIOATION FILED 1330.17. 1906.

3 SHEETS-SHEET 3.

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CHARLES n. MosHER, oE NEW YORK, N. Y.v

STEAM-BOILER.

Specicaton of Letters Patent.

Patented Nov. 26, 1907'.

Application filed December 17. 1906. Serial No. 348.298.

To all whom it may concern:

Be it known that l, CHARLES D. MosnER, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful `Improvements in Steam-Boilers, of which the followin is a specification.

This invention re ates to the type of watertube steam-boilers embodying a single transverse steam-and-water drum at the front of the boiler, a parallel water-drum structure at the rear of the boiler, and a series of inclined tubes connecting the water-drum structure with the steam-and-water drum. Although this style of boiler is'light, simple, compact, highly efficient, and ineX ensive to build, operate, and repair, some ifliculty has heretofore been experienced in giving the furnacegases a sufficient time-contact with the tubes, especially when. under forced draft, and it has also frequent y been found necessary to Hatten the tube-sheets of one or more of the drums in order to admit a sufficient number of straight or nearly straight tubes and lead them in substantially normal to the tube-sheets. l

' My improvements involve the subdivision of the water-drum structure into a plurality of drums of a smaller diameter than that of a single drum which would take the same number of tubes, thereby strengthening the Water drums, permittingthem to be made by a simple process of manufacture, allowing the total tube-group to be subdivided into a se-v ries of sub-groups with spaces between to permit` soot accumulation and the introduction of baffles, permitting access to the interior of the tube-group through the water-- drum structure, and spreading the rear end of the tube-group fan-wise to allow for straight or nearly straight tubes which will enter a cylindrical steam-and-water drum nearly at right-angles. This construction also facilitates the location of permanent blast-pipes for dislodging soot, and also enables the tubes to be withdrawn through a narrow zone of holes located in the front wall of the steam-and-water drum and provided with removable covers. Other incidental advantages will appear. in the succeeding description.

Of the accompanying drawinws, Figure 1 represents a vertical longitudinasection of a Water-tube steam-boiler embodying my improvements. Fig. 2 represents afront elevation thereof, partly in section. Fig. 3 represents a rear elevation, partly in section.

The same reference characters indicate the same parts in all the views.

10 is the transverse horizontal steam-andwater drum located at the front end of the boiler and 11, 11 are three parallel horizontal c liiidrical water-drums located in a vertical tier at the rear of the boiler and connected with each other (as here shown) by short vertical pipes 12 of large diameter near the two ends of the drums, giving the three drums a common water-space. The lowerrnost drum is connected by two short ipes 13 with two horizontal pipes 14 exten ing from front to rear along the sides of the boiler and connected at their front ends by two upright pipes or down-takes 15 with the steam-and-water drum 10, for providing an external return circulation. Other forms of connectionv between the drums may be substituted to accomplish the' same purpose as the large-diameter pipes 13.

The evaporating-tube-group is composed of three sub-grou s of tubes 16 connecting the three waterrums 11 with the steamand-Water drum 1() and having considerable upward pitch or inclination, the lowest group having the steepest pitch and the upper group the least pitch so that the entire group is spread somewhat fan-Wise. vThis enables the upper ends of the tubes to enter the tubesheetof the steam-and-water drum 10 very nearly normal or at right-angles without requiring said tube-sheet to be Hattened or requiring any great curvature in the tubes, and also directs the tubes toward a narrow zone in the front wall of drum 10 through holes in which the tubes ma be withdrawn as hereinafter described. he water-drums 11 may also be cylindrical since each receives the ends of only a portion of the total number of tubes, and their small diameter strengthens them and permits their bodies to be made out of single- 'iece pipe if desired.

Between t e three sub-groups of tubes 16 are two wedge-shaped o en spaces 17 giving access to the interior of title oup and affording space for the accumu ation and withdrawal of soot and cinders.l These spaces further constitute' secondary chambers in which the gases distribute themselves and in which any unburned gases have an opporloo ' out contact with the tubes, especially with upper rows -of tubes in the two lower sub-v lation of soot or cinders.

long-flaming fuels or when operating under forced draft. In the-lower space 17 is located a refractory baffle 18 overlying the lower sub-group of tubes and extending from the llower Water-drum 11 about twothirds of the distance toward the steam-and- 'Watr drum 10. i From its upper edge an u right transverse bale 19 extends across t 1e mlddle sub-grou of tubes and the upper free space -17 an par-t way across the upper v roup of'tubesor the purpose of leading the mace-gases across the upper portions of all the tubes into a space 20 in the casing above the tuberoup, from which the gases return downwardly across the upper sub-group of tubes and into the middlesub-grou thence around the lower edge of a secon upright baffle 21 and upwardly across the'rear portion of the upper sub-group of tubes into a stack 22 located at the rear of the boiler. At the lower edges of the baflles 19 and 21 I prefer to locate permanent steam-blast pipes 23, 24 supplied with steam from a ipe 25 connecting with the steam-drum and aving a series of steam outlets or perforations so directed as to sweep 'the tubes in practically all directions and dislodge any accumu- The dislod ed dust-will fall into the furnace 26 located elow the water-tubes and into the lower free space 17 onto the baffle 18, .from which it may be removed through doors-27- in therear casing alined with the space between the lower` and middle water-drums 11. Similar doors 28 afford access to the space between the middle and up er drums to the upper free space 17. The last-pipes 23, 24 may be squared as shown and rest for support on the groups, whereby they are also somewhat protected :from burning out.

For the' removal and re lacement of tubes I prefer to provide a xseries of holes in the front shell of the steam-and-water drum 10 filled by removable covers 29 and so located with reference to the tubes 16 that a large number of tubes may be removed through any one hole,V The covers 29 are shown as screw-plugs, but any suitable form of cover or filler may be used. The arrangement for withdrawal of tubes may be as in patent to Blechynden No. 658,615, showing a single `row of holes for a group of curved tubes, or as in my Patent No. 657,783 showingstraight vtubes and several rows of holes, but in any case my resent fan-wise arrangement of tubes ena les the zone of holes to be narrowed.

It will be seen that the free spaces 17 in the interior of the tube-group afford increased facilities for` manipulating the tubes in passing them through the pluwholes, and if it is not desired to provide hoes for tube- .removal these interior spaces will still simand the passage of the gases among lthese lower tubes. The joining of the ends of all ot the water-*tubes into la single steam-andwater drum has vmany advantages which have been demonstrated in steam-boilers, especially in the matter of free circulation, rapid liberation of steam bubbles into a single steam-space, and low cost of construction. It further affords a lofty combustionchamber for the furnace and gives a steep pitch to the tubes, which promotes rapid circulation and egress of steam bubbles.

I am aware of British patent 23 ,77 7 of 1897 to Sampson, and U. S. patent 638,716v toy HoXie, and I do not claim what is disclosed in said patents. An advantageous eect due to my construction of elevated drum and theA plurality of lower water-drums and the connecting water-tubes and the .baflies, is not obtainable by eitherSampson or Hoxie.

1. A water-tube boiler comprising a furnace., an elevated drum, a plurality ot lower water-drums, a group of water-tubes connecting the elevated drum with the lower drums, and baii'les for leading the gases upward among all of the tubes adjacent to the` elevated drum and then downwardlyamong some of thesame tubes.

2. A water-tube boiler comprising a furnace, an' elevated drum, a plurality of lower water-drums, a group Vof water-tubesconnecting the elevated drum with the lower drums and composed of sub-groups of tubes leadin to the respective lower drums and locate in successive positions with respect to the path of the urnace gases1 and baiiies -tor leadingthe gases upward among all of the tubes adjacent to the elevated drum and j then downwardlyamong some of the .same

tubes. i

3. A water-tube boiler comprising a furnace, an elevated drum, a plurality of lower water-drums, a group of water-tubes connecting the elevated drum with the lower` drums and composed of sub-groups of tubes leadin to the respective lower drums and locate in successive positions with respect to the path of the furnace gases, baflles for leading the gases upward among all of the tubes adjacent to the elevated drum and then downwardly among some of the same tubes, and transverse blast-pipes located at the edges of said bafiles 4and having steam outlets for directing a spreading steam-blast among the tubes.

4. A Water-tube boiler comprising a furnace, an elevated drum, a plurality of lower water-drums, a group of Water-tubes connectingtheelevated drum with the lower drums and composed of sub-groups of tubes leading to the respective lower drums and located in successive positions with respect to thepath of the 'furnace gases, a baffle eX- tendingfrom the lower one of the plurality of lower water-drums and located between the lowermost and next higher of the subgroups of tubes, an upright transverse balle extending from the upper end of the last named battle across most of the tubes of the upper groups, and a second upright baille 15 In testimony whereof I have hereunto set 20 my hand in the presence of two subscribing witnesses, the 12th day of December, 1906. CHARLES D. MOSHER. Witnesses:

R. M. PIERsoN, G. BLAKE. 

